Multiple-telegraph relay



J. 0. WILSON. Multiple-Telegraph Relay.

No. 229,068. Patented June 22,1880.

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JOHN G. VILSON, OF BOSTON, MASSACHUSETTS.

MULTIPLE-TELEGRAPH RELAY.

SPECIFICATION forming part of Letters Patent No. 229,068, dated June 22,1880.

Application filed January 19, 1880.

To all whom it may concern Be it known that I, J OHN- OOENELIUs WIL-SON, of Boston, county of Suffolk, State of Massachusetts, have inventedan Improvement in Relays for Multiple Transmission Telegraphs, of whichthe following description, in connection with the accompanying drawings,is a specification.

My invention relates to a relay for duplex or multiplex telegraphy, andis shown in connection with other rcceiving-instrun'ients of the duplextelegraph invented by Dr. J. B. Stark for sending simultaneous messagesin the same direction by the use of two batteries of different strength.In that system two relays are used at the receivingstation, one, whichmaybe called the weak relay, adjusted to respond under the influence ofthe weak, and the other, which may be called the strong relay, underthat of the strong, battery, the latter or strong relay at the same timeapplying a current from alocal battery through a second coil on thefirst mentioned or weak relay in such manner as to neutralize the elfectof the strong battery thereon, thereby leaving the said weak relay incondition to respond to its own or weak battery whatever be thecondition of the other relay and battery. The said localneutralizing-battery is applied to act on the weak relay by the strongrelay, which completes its circuit through the front stop and armatureof said strong relay, and consequently the strong battery is actingunbalanced upon the weak relay during the time that said strong-relayarmature is moving from its back to its front stop, which is a seriousobjection, rendering the system practically unavailable for telegraphicpurposes.

To overcome this objection is the object of my present invention, whichconsists in pro vidin g suitable contact-points and connections, incombination with the armature-lever and front and back stops of thestrong relay, whereby the local neutralizing-battery is applied to theweak relay the instant the strong-relay armature leaves its back stop,and remains so applied until the instant the said armature leaves thefront stop.

Figure 1 shows a receiving-relay, to be affected by the strongerbattery, embodying my invention, the local battery and connections withthe weak relay being also shown Fig. 2, a top view of therelay-instrument alone, and Fig. 3 a modification to be referred to.

The main line 2 from the transmitting-sta tion passes through the coilsof the strongrelay electro-magnet a and those I) of the weakrelayelectro-magnet. A second coil, 0, will be used in connection with thatof the weak relay, the said coils in practice being wound on the samecore with the one bof the electromagnet, but shown separately forclearness.

The local battery (I is so connected in circuit with the coil 0 andadjusted by resistance or otherwise that the eliect of its current inthe coil 0 will just balance that of the strong battery from the distantstation in the coil 1), to thus leave its armature unattracted by thetwo currents together.

The features described up to this point are old and form no part of myinvention.

The armature c of the strong-relay magnet, pivoted atf and provided withthe usual retracting-spring, carries on one side a contactpoint, 1,insulated therefrom, the said armature c and contact-point g beingadapted to contact with two points, h 1 respectively, of a movablecontact piece, j. (Shown as U- shaped, and pivoted at Z.) This U-shapedcontact-piece moves with a slight friction at l, or is otherwise adaptedto remain against either of the stops in a which it may be in contactwith until positively moved by the armature e away from it and intocontact with the other stop, the ends th of said contactpieces beinginterposed between the ends of the armature e and front and backrelaystops, a m, respectively.

One pole of the battery, cl, is connected with the contact-piece j bywire 3, and the other pole by wire 4:, coil 0, and wires 5 6, with theback relay-stop m, and also by branch 7 with the insulated point g onthe armature c. A wire, 8, to shunt the coil 0, is connected to thearmature c and wire at between the battery and coil 0.

As shown in the drawings, the armature is passing from the back to thefront stops.

Vhile resting on the back stop the coil 0 is shunted, the circuit of dthen being through wires 4 8, armature 6, U-shaped piece, and wire 3.

The moment the armature leaves its back stop h m the shunt-circuit isbroken at 0 IL, and the circuit of d. is now through wire 4, the coil 0,wires 6, points at h, and wire 3, thereby immediately bringing the coil0 into action.

When in the forward movement of the armature the point 9 meets the end iof the U- shaped piecej the circuit of battery dis through wire 7 andpoints 9 t", the wire 6 and the point at being removed from thecircuitlast described. The circuit remains in this condition as long asthe armature c is attracted; but the moment it recedes from the frontstop the said circuit is broken at g i, and when the armature e, in itsbackward movement, reaches the end 71 of the U-shaped piece the circuitis shunted through the wire 8, as before described.

It is obvious that a relay constructed in this manner might be used tooperate the usual recording-instrument which would take the place ot thecoil 0, or that the said recordinginstruments might be inserted in thewire 5 in connection with the instruments shown.

The recording instruments and sonnders may, however, be operated by aseparate battery, the circuit otwhieh may be closed through either ofthe relay-stops m a and the U-shaped piece, or through the back stop atand armature, the two being electrically connected through the end h ofthe U-shaped piece, which co-operates with the stops at a to form whatmay be called compound stops for the armature c.

It is obvious that other forms may be given to the U-shaped piece, andthat various means may be used to cause it to remain in contact witheither stop until positively moved away by the armature-as, for example,it may be pivoted as an inverted pendulum, and so rest against eitherstop by its own weight, or a small magnet may be placed at each side,the U-shaped piece being of iron.

The movable contact-piece may be a second lever pivoted at or near f,with its upper end curved over the end of the armature e, as in Fig. 3.

1. In a multiple telegraphic apparatus, a relay adjusted to respond tothe current of a distant weal; battery, and provided with a secondarycoil to be placed in circuit with a local battery, and a second relay,adjusted to respond to a stronger distant battery than the first, andadapted, at the instant its armature begins its forward movement, tocause, by said movement, the current of the local battery to passthrough the secondary coil of the first relay, and at the instant thesaid armature begins its backward movement to break the circuit of saidlocal battery, substantially as and for the purpose described.

2. An electro-magnet and its armature provided with an insulatedcontact-point and front and bacl: stops therefor, and a movable contactpiece with two points, one interposed between the armature and one ofthe said stops and the other between the insulated point of the armatureand the other stop, whereby, when the parts are suitably connected incircuit with a battery, the circuit of the said battery is changed orbroken the instant the said armature begins its movement in eitherdirection, substantially as described.

3. ln a telegraphic apparatus, a relay and its armature provided with aninsulated contact-point and front and back stops therefor, combined witha movable contact-piece having two points, one between the armature andone stop and the other between the insulated point of the armature andthe other stop, the said contact-piece being adapted to remain incontact with either of the said stops until positively moved intocontact with the other stop, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnessess.

JOHN CORNELIUS WILSON.

itnesses N. F. O. WHITNEY, J os. P. LIVERMORE.

